Fiber Connections

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The Bits and Bytes of Computer Networking

3726 classificações

Google

The Bits and Bytes of Computer Networking

3726 classificações

Curso 2 de 5 em Specialization Google IT Support Professional Certificate

This course is designed to provide a full overview of computer networking. In this course, we’ll cover everything from the fundamentals of modern networking technologies and protocols to practical applications and network troubleshooting. By the end of this course, you’ll be able to: - describe computer networks in terms of a five-layer model. - understand all of the standard protocols involved with TCP/IP communications. - grasp powerful network troubleshooting tools and techniques. - learn network services like DNS and DHCP that help make computer networks run. Except as otherwise noted, the contents on this site are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Connecting to the Internet

In the fifth week of this course, we'll explore the history of the Internet, how it evolved, and how it works today. We'll understand the different ways to connect to the Internet through cables, wireless and cellar connections, and even fiber connections. By the end of this module, you'll be able to define the components of WANs and outline the basics of wireless and cellular networking.

What is broadband?3:11

T-Carrier Technologies2:18

Digital Subscriber Lines3:59

Cable Broadband4:03

Fiber Connections2:49

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The core of the internet has long used fiber for its connections,

both due to higher speeds and because fiber allows for

transmission to travel much further without degradation of the signal.

Remember that fiber connections use light for

data transmission instead of electrical currents.

The absolute maximum distance an electrical signal can travel across

a copper cable before it degrades too much and requires a repeater is thousands of feet.

But, certain implementations of fiber connections can travel many,

many miles before a signal degrades.

Producing and laying fiber is a lot more expensive than using copper cables.

So, for a long time,

it was a technology you only saw in use by ISPs

within their core networks or maybe for use within data centers.

But in recent years,

it's become popular to use fiber to deliver data closer and closer to the end user.

Exactly how close to the end user can vary a ton across implementations,

which is why the phrase FTTX was developed.

FTTX stands for fiber to the X,

where the X can be one of many things.

We'll cover a few of these possibilities.

The first term you might hear is FTTN,

which means fiber to the neighborhood.

This means that fiber technologies are used to deliver data to

a single physical cabinet that serves a certain amount of the population.

From this cabinet, twisted pair copper

or coax might be used for the last length of distance.

The next version you might come across is FTTB.

This stands for fiber to the building,

fiber to the business or even a fiber to the basement,

since this is generally where cables to buildings physically enter.

FTTB is a setup where fiber technologies

are used for data delivery to an individual building.

After that, twisted pair copper is typically

used to actually connect those inside of the building.

A third version you might hear is FTTH,

which stands for fiber to the home.

This is used in instances where fiber is actually run to

each individual residents in a neighborhood or apartment building.

FTTH and FTTB may both also be referred to as FTTP,

fiber to the premises.

Instead of a modem,

the demarcation point for fiber technologies is known

as Optical Network Terminator, or ONT.

An ONT converts data from protocols the fiber network can

understand to those that are

more traditional twisted pair copper networks can understand.

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